Re: [alsa-devel] [PATCH 1/2] devicetree: Add devicetree bindings documentation for the ADAU1977

4 Feb 2014

      On 02/03/2014 04:15 PM, Geert Uytterhoeven wrote:
...
On Mon, Feb 3, 2014 at 3:57 PM, Lars-Peter Clausen lars@metafoo.de wrote:
...

adi,micbias: Configures the voltage setting for the MICBIAS pin. If not

specified the default value will be 8.5 Volts. This property is only valid
for the ADAU1977.
Valid values for this property are:
  0: 5.0V

  1: 5.5V

  2: 6.0V

  3: 6.5V

  4: 7.0V

  5: 7.5V

  6: 8.0V

  7: 8.5V

  8: 9.0V

This means the casual DTS reader need to know about the meaning of
the values. You can avoid that by:

Using preprocessor defines. Drawback is that you have to add an
include file.
Using mV, and specify minimum, maximum, and incrementals in the
bindings, cfr.

Documentation/devicetree/bindings/power_supply/ti,bq24735.txt
      Drawback is that the user can easily specify invalid values.
Is there a preference for either of them?
Thanks,
- Lars